Fill in the missing amounts in each of the eight case situations below.

\begin{tabular}{|c|c|c|c|c|c|c|c|c|c|c|c|c|} \hline & \multicolumn{3}{|c|}{ Case 1} & \multicolumn{3}{|c|}{ Caso 2} & \multicolumn{3}{|c|}{ Case 3} & \multicolumn{3}{|c|}{ Case 4} \\ \hline Sales & $ & 450,000 & & $ & 201,000 & & & & & $ & 304,000 & \\ \hline Variable expenses & & & & & 128,640 & & & & & & 79,040 & \\ \hline Contribution margin & & & & & & & & & & & & \\ \hline Fixed expenses & & & & & 55,000 & & & 474,000 & & & & \\ \hline Net operating income (loss) & S & 64,500 & & & & & $ & 65,000 & & $ & (6,040) & \\ \hline Contribution margin ratio (percent) & & 39 & % & & & % & & 77 & % & & & % \\ \hline \end{tabular} Required A